CZ285595A3 - Variable reluctance motor, particularly for washing automatic machine drive - Google Patents

Abstract

In order to reduce the operating noise of a reluctance motor having rotor poles (2.1) which have reduced reluctance and are distributed over the rotor circumference thus forming cut-outs (5) having increased reluctance, the cut-outs (5) are provided, at least on the circumferential side of the rotor, with a filling (2.11; 3.1, 3.2) with a smooth circumferential surface for the purpose of preventing noise being formed by turbulence and with a magnetic permeability for the purpose of preventing noise being formed by magnetostriction and/or moment pulsation, with a rotor which rotates relative to the stator (1) during operation. <IMAGE>

Description

Reluctance motor, especially for washing machine washing

Technical field

BACKGROUND OF THE INVENTION The present invention relates to a reluctance motor, in particular for a washing machine, with individual rotor poles of low magnetic resistance distributed along the circumference of the rotor without windings, while providing recesses with increased magnetic resistance, the recesses at least on the side facing the rotor. the filler to provide a smooth circumferential surface to prevent the formation of noise due to swirling.

Bosavadní_stav_techniky

Such a reluctance motor is known, for example, from the treatise Reluctance motor connected as a rugged stroke motor from ELEKTRONIK 16/1992, pages 72-75. Said electric motor, for example, is also intended for use as a centrifugal motor for a washing machine. A reluctance motor typically consists of a circumferentially distributed stator array with stator poles with associated excitation coils and a rotor array without coil with rotor poles distributed circumferentially and with recesses remaining therebetween so as to create bands of increased or reduced magnetic resistance to the roxor. and between the stator. If we consider nr ´ ´ ´ - magnetic flux between stator and rotor as a function of rotor current and position, then the mo2 and torque, however, can be distinguished from areas where there is no overlap of the rotor pole or the rotor. stator, to partially overlap the poles, to completely overlap the poles, and to reduce the pole overlap. By further connecting the field windings through the current of the stator poles and optionally the pulse width modulation, speed control can be achieved which, despite substantially the poison of the motor, is comparable to other variable speed drives such as commutator motors or induction motors powered by rectifiers.

U.S. Pat. DE-A1-39 05 997 discloses a reluctance motor with a rotor having individual poles without windings, and in order to prevent air whirling, covers with extensions extending on both sides in the circumferentially and the interspaces between adjacent ends of the extensions are covered with cover elements. The individual covers and cover elements consist of plastic, as well as the coil bodies on the stator side.

SUMMARY OF THE INVENTION

SUMMARY OF THE INVENTION It is an object of the present invention to provide low operating noises in the reluctance motor according to the invention, in comparison with known comparable commutator motors or inverter-driven induction motors, at low weight and low production costs, even at high speeds.

that noise filling

This object is achieved in the case of a reluctance motor of the aforementioned type with recesses provided at least on the side of the circumference of the rotor with a filler, according to the invention by having a magnetic conductivity preventing magnetic rotation or rotation. torque pulsation.

Advantageous embodiments of the invention are set forth in the subclaims.

The fillings provided according to the invention eliminate the noises occurring, in particular at higher speeds, as a result of turbulence in the surrounding medium between the stator poles and the rotor poles. Furthermore, the formation of noise is also prevented by magnetostriction and / or magnetostriction. torque pulsation when the rotor poles suddenly enter the flow regions by the stator poles. It will be appreciated that when dimensioning the soft-magnetic transitions between adjacent rotor poles, it should be taken into account that a magnetic short-circuit would substantially reduce the power-determining torque. This can be prevented by appropriate dimensioning of the fillings and by deliberate constrictions in the fillers connecting adjacent rotor poles.

According to a first embodiment of the invention, the fillings are made of magnetically conductive and can be inserted as a block between the rotor poles or can be produced by injection molding in the case of loose bundles of rotor plates.

For particularly simple production engineering cause harmful over _{according to} another embodiment of the invention, it is proposed to create a fill to the edges of the slats rotor stack simultaneously embossed laminated yoke which Přech zejí continuously at an apex of the rotor poles and a plastic modified dopant material, ^χ · * ^ i

dimensioning, event. to create magnetic tapered transitions so as to avoid a torque-reducing magnetic short between adjacent rotor poles of different polarity.

Image_view ha_drafts

The invention as well as other preferred embodiments of the invention will be explained in more detail below with reference to the exemplary embodiments shown in the drawing.

FIG. 1 is a schematic cross-sectional view of a construction of a conventional reluctance motor with gaps between rotor poles.

FIG. 2 shows a first embodiment of an engine according to the invention.

rotor

Fig. 3 shows a second embodiment of a rotor according to the invention for a reluctance motor.

FIG. 4 shows a third embodiment of a rotor according to the invention for a reluctance motor.

Example ady_oroyed.no_vy find

Giant. 1 shows, in a radial cross-section, a reluctance motor with a lamellar stator bundle 1 The illustrated embodiment of the stator relates to a three-phase motor with a stator yoke 1.1 and two stator poles 1.2 for one phase, each diametrically opposed to so5, and the vertical rotor poles n with each other being always s. by one excited winding 1.3.

The illustrated rotor blade bundle 2 relates to an embodiment with four outstanding rotor poles 2.1 and intermediate recesses 5. In the embodiment shown and the assignment of the stator poles 1.2 to the rotor poles 2.1, the horizontal rotor poles 2.1 are in areas of complete overlap with their one apex - an increasing overlap region and a pole aperture in the decreasing overlap region

In the literature, in particular for the use of reluctance motors ^and electric motors ¹¹ , or of the regulated motors, the stator tooth or the designation of the stator tooth and / or motor are introduced for the stator pole or the designation. rotor torsion tooth.

and.:

The driving of the excitation coils is carried out in a manner not shown in more detail here by means of an electronic control device with a circulating winding current and, optionally, pulses of the pulse-armed modulation of a given motor actuation with motor control.

Giant. 2 to 4, shown in FIG. 2, they show three different embodiments according to the invention for reducing noise.

In the recesses 5 between the rotor poles 2.1, they are inserted or formed by injection molding 3 of plastic, which consists of blocks 3.1 with ferromagnetic conductivity or blocks 3.2 without ferromagnetic conductivity, so that the center between two adjacent rotor poles 2.1 is narrow magnetic passage. However, in the immediate tangential adjacent regions of the pole peaks of the rotor zones 2.1, a loop mitigating the noise generated by the magnetosuction is preferably formed.

r rc strength increase with rotor poles 2.1 .15.

In the form-locking grip of the panels, the panels are provided with protrusions

In the preferred manufacturing process, the fillers in the embodiment according to FIG. 2 consist of plastic blocks 3.1, to which a granular ferromagnetic material is preferably admixed.

Giant. 3 and 4 show two exemplary embodiments, according to the invention, at the peripheral edges, at the peripheral edges, at the tops of the lamellas of the rotor plate bundle 2, the lamella brackets 2.11 are embossed. To prevent magnetic short circuits between adjacent rotor poles 2.1, magnetic narrow passages are provided in the form of punches 2.12 according to FIG. 3 or 2.13 _± 2.14 according to FIG. 4. FIG. 3 shows an arrangement of narrow passages in the middle between adjacent rotor poles 21 in a motor that can be used in both directions of rotation. Giant. 4 shows a rotor blade bundle 2 with a motor intended for only one direction of rotation n, in which the magnetic bottlenecks 2.13 _x 2.14 are offset off center in the direction of rotation n.

Claims (9)

A reluctance motor, in particular for a torch, washing machine, with individual rotor poles of low magnetic resistance distributed along the periphery of the rotor without windings, while producing recesses with increased magnetic resistance, wherein the recesses, at least on the side facing the rotor periphery, are provided with padding. for forming a smooth peripheral surface for preventing the formation of noise due to turbulence, characterized in that the filler (2.11; 3) has a magnetic conductivity preventing the generation of noise produced during operation of the rotor (2) relative to the stator (1), . torque pulsation. . X1 ’>οα> 89 f'o The reluctance motor according to claim 1, characterized in that it has at least one magnetic narrow passage (2.12; 2.13, 2.14; 3.2) between the circumferentially adjacent rotor poles connected by the filler (2.11; 3). Reluctance motor according to claim 2, characterized in that the narrow passage (2.12; 3.2) is in a circumferential direction in the middle between two adjacent rotor poles (2.1). Reluctance motor according to claim 2, characterized in that the narrow passage (2.13; 2.14) is offset off-center in the direction of rotation (n) in the circumferential direction. 5. The reluctance of claims 1 to 5 is made of artificial material. engine according to one of the previous- " 4, characterized in that the filler mass is magnetically conductive Reluctance motor according to claim 5, characterized in that the packing (3) is assembled from blocks (3 * 2) of non-ferromagnetic plastic and from ferromagnetic blocks (3.1). A reluctance motor according to claim 6, characterized in that the ferromagnetic blocks (3.1) are made of plastic with an admixture of a ferromagnetic, preferably granular material. 8. Relatively connected (3.1) to a connected motor according to any one of the preceding years 1 to 7, characterized in that they are shaped with adjacent arrays (2) by means of projections (2.15). to 6, you from: škol h sheet metal lů (2.1) Sim edge nu (2.11) 9 oru running The reluctance motor according to any one of claims 1 to 6, characterized in that the blades of the rotor beam packings with fillers have integral one-piece blades (2.11) formed on the outside of the rotor blades and are designed to form blades (2.11). gaps (2.21; 2.13, 2.14).